6-208 SECTIO N 653 – EROSIO N PREVENTIO N AND SEDIMEN T CONTROL 653.0 1 DESCRIPTION . This work shall consist of the design and modification of the erosion prevention and sediment control (EPSC) plan or furnishing, installing, monitoring, maintaining, removing, and disposing of erosion prevention and sediment control measures in accordance with these specifications. 653.0 2 MATERIALS . Materials shall meet the requirements of the following subsections: Coarse Aggregate for Concrete ................................ ................................ .................. 704.02 Dense Graded Crushed Stone for Subbase ................................ ................................ 704.06 Aggregate for Erosion Prevention and Sediment Control ................................ ......... 704.17 Geotextile Under Stone Fill ................................ ................................ ....................... 720.04 Geotextile for Silt Fence ................................ ................................ ............................ 720.07 Barrier Fence ................................ ................................ ................................ .............. 727.03 Project Demarcation Fence ................................ ................................ ........................ 727.04 Hay Mulch ................................ ................................ ................................ ................. 755.10(a) Wood Chip Mulch ................................ ................................ ................................ ......755.10(b) Fiber Mulch ................................ ................................ ................................ ................ 755.10(d) Hydraulic Matrix ................................ ................................ ................................ ........ 755.10(e) Tackifier ................................ ................................ ................................ ..................... 755.10(f) Straw Mulch ................................ ................................ ................................ ............... 755.10(g) Rolled Erosion Control Product, Type I ................................ ................................ ....755.11(a) Rolled Erosion Control Product, Type II ................................ ................................ ...755.11(b) Erosion Logs ................................ ................................ ................................ .............. 755.1 4 Woven wire reinforcement shall be a minimum of 14 -gauge mesh with a maximum me sh opening of 6 inches. Posts for silt fence shall be wood, with minimum dimensions of 1 inch × 1 inch, or steel. Steel posts shall meet the requirements specified in AASHTO M 281 or AASHTO M 181. Filtering aggregate shall meet the requirements of Subsecti on 704.02 and Table 704.02 C or Subsection
704.06 .
653.0 3 EPSC PLAN . The Contractor shall be responsible for the development of an EPSC plan and shall become a co -permittee with the Agency on project s with associated permits.
a.Development . The Contractor shall develop an EPSC plan. When an EPSC plan is included in the Contract the Contractor may use the included EPSC plan as a basis for making modifications . All Contractor submitted EPSC plans shall meet the requirements of the Agency’s Erosion Prevention and Sediment Control Plan Contractor Checklist and all project permits. 6-209 When construction activities occur in phases requiring successive phases of the EPSC plan, those phases shall be included in the EPSC plan. The preparer of the EPSC plan shall be a licensed professional engineer , a Certified Professional in Erosion and Sediment Control (CPESC) certified by Enviro Cert or an equivalent as determined by the Engineer. The EPSC plan shall be stamped if prepared by a professional engineer and signed if prepared by a CPESC (or equivalent) . This shall occur even if the EPSC plan included in the Contract is used unmodified. The current EPSC plan and all manuals, ch ecklists, forms , and other supporting documentation necessary to maintain compliance with associated permits shall be available to the Engineer and maintained on site by the Contractor.
b.Submittals . The Contractor shall submit the EPSC plan and an updated risk evaluation as required by the permit and preparer certification, if necessary, to the Engineer to determine conformance . The EPSC plan shall be submitted in accordance with Subsection 105.0 6(c)(2). The Engineer will provide a conformance memo or comments to the Contractor within 10 work ing days of the receipt of the EPSC plan. The Contractor shall submit a revised EPSC plan, addressing all comments, within 10 work ing days of receipt of comments . This cycle shall continue until a conformance memo has been issued for the EPSC plan. The submittal process will not be considered as an acceptable delay of the work under Subsection 108.11 . The EPSC plan, and each subsequent revision, which have demonstrated conformance, shall be forwarded to the Vermont Agency of Natural Resources as appropriate. Construction activities shall not commence prior to issuance of a conformance memo for the EPSC plan by the Engineer . For project s where Vermont Agency of Natural Resources authorization is required, construction activities shall not commence until the conformance memo for the EPSC plan has been issued by the Engineer and authorized by the Vermont Agency of Natural Resources . 653.0 4 MONITORIN G EPSC PLAN . The Contractor shall be responsible for monitoring all EPSC measures in accordance with the conforming EPSC plan and Contract from installation of the EPSC measures through removal of the EPSC measures or acceptance of the project , whichever applies.
a.On-Site Plan Coordinator . The Contractor shall designate an on-site plan coordinator (OSPC) that is responsible for monitoring the implementation of the EPSC plan on the project . The OSPC shall generally be on -site daily and shall have the authority to halt c onstruction activities if necessary. 6-210 The OSPC shall have demonstrated experience in construction practices as they relate to erosion prevention and sediment control as well as a general understanding of state and federal environmental regulations and permits pertaining to the National Polluta nt Discharge Elimination System construction program . The OSPC shall be proficient at reading and interpreting engineering and EPSC plans.
b.Inspection . For Non -Jurisdictional and Low Risk Project s, inspections shall be conducted using the Agency’s EPSC Plan Inspection Report (Non -Jurisdictional and Low Risk Projects ). For all other project s, inspections shall be done in accordance with permit requirements.
1.Active Construction . Inspection shall occur once every 7 calendar day s and within 24 hours of the end of a storm event that results in a discharge of stormwater from the site. Between October 15th and April 15th, inclusive , inspections shall occur daily for disturbed areas and at all areas that have not achieved permanent s tabilization.
2.Inactive Construction . Inspection shall occur at least once every 30 calendar day s and within 24 hours of any storm or significant snow melt event that may cause stormwater runoff. The Contractor shall contact the Engineer prior to conduc ting any inspection. The Contractor shall provide, within 24 hours, the necessary personnel, equipment , and material s to repair or correct any deficiencies identified during inspection . All deficiencies and corrective measures taken shall be documented in the inspection reports. 653.0 5 MAINTENANC E OF EPSC PLAN . The Contractor shall provide all labor and equipment necessary for field maintenance of erosion prevention and sediment control items not included in the Contract, and providing material s and labor necessary for installing, monitoring, maintaining and, where necessary, removing additional measures needed to correct deficiencies that develop during construction that lessen the performance of the EPSC plan. Erosion prevention and sediment control measures shall be maintained by the Contractor and removed when authorized by the Engineer. The Contractor shall establish vegetation in all areas disturbed during installation, maintenance and removal of the erosion prevention and sediment control measures. Any maintenance required due to the failure of the Contractor to follow the conforming EPSC plan shall be performed at no additional cost to the Agency. 653.0 6 DELINEATIO N MEASURES .
a.Barrier Fence . Barrier fence shall be installed as a visib le barrier beyond which there shall be no construction activity by the Contractor or project personnel. Barrier fence shall be installed at the locations shown on the Plans, in accordance with the Contract and as directed by the Engineer. 6-211 Barrier fence sh all be installed on W-shape steel posts. The fence shall have a minimum height of 4 feet. The posts shall be embedded a minimum of 2 feet into the ground, extend above the fabric, and be installed at a 5 -foot spacing. The Contractor shall install, inspect, and maintain barrier fence in accordance with the Contract or as directed by the Engineer. The Contractor shall remove barrier fence from the project when deemed no longer necessary by the Engineer, and the barrier fence shall remain the property of the C ontractor.
b.Project Demarcation Fence (PDF) . PDF shall be installed as a visible barrier beyond which there shall be no construction activity by the Contractor or project personnel. PDF shall be installed at the locations shown on the Plans, as per the Contract and as directed by the Engineer. PDF shall be installed on hardwood stakes and shall have a minimum width of 3 inches. The stakes shall be 1 inch × 1 inch × 4 feet, shall be embedded 1 foot into the ground, extend above the fabric, and be installed at a 10 -foot spacing. The Contractor shall install, inspect, and maintain PDF in accordance with the Contract or as directed by the Engineer. The Contractor shall remove the PDF from the project when deemed no longer necessary by the Engineer, and the PDF shall remain the property of the Contractor. 653.0 7 STABILIZATIO N MEASURES . Stabilization measures shall be used to prevent erosion of disturbed soils in accordance with the Contract . All stabi lization measures described in this subsection, with the exception of Type II rolled erosion control product, are temporary erosion control measures.
a.Mulch . Mulch shall be applied uniformly in accordance with the application rates specified herein and maintained by the Contractor during construction .
1.Hay Mulch . Hay mulch shall be applied at a minimum rate of 2 tons per acre. Hay mulch shall only be used in areas with a slope flatter than 1:3 (V:H) . Tackifier may be used with hay mulch, as determin ed by the Engineer, in areas where hay mulch will not stay in place.
2.Hydraulic Mulch . Hydraulic mulch shall consist of applying a fiber mulch or hydraulic matrix with hydro -mulching equipment . 6-212 Fiber mulch shall be mixed in a hydraulic application machine and applied as a liquid slurry in accordance with the manufacturer’s specified procedures and rates. Fiber mulch shall be applied from multiple directions and angles to ensure complete and prope r coverage , and only when rainfall is not predicted for at least 12 hours. The fiber mulch shall be applied such that the entire area is covered to a depth of at least 1/8 inch. Hydraulic matrix shall be hydraulically applied to the soil as a viscous mixtu re, creating a continuous three -dimensional blanket that adheres to the soil surface. Upon drying, the matrix shall form a high -strength, porous, and erosion -resistant mat that shall not inhibit the germination and growth of plants in and beneath the layer . The matrix shall retain its form despite re -wetting. Pedestrians or equipment shall not be permitted to enter areas where mixtures containing stabilizing emulsion have been applied until vigorous vegetation is established.
3.Straw Mulch . Straw mulch sh all be applied at a minimum rate of 2 tons per acre. Straw mulch shall only be used in areas with a slope flatter than 1:3 (V:H).
4.Wood Chip Mulch . Wood chip mulch shall be applied to a depth of 1 inch.
b.Rolled Erosion Control Product . Rolled erosion control products, of the type specified, shall be installed at the locations shown on the Plans or as directed by the Engineer. The ground surface shall be shaped to the lines and grades shown on the Plans and be free of any depressions or objectionable material that would allow water to collect and flow beneath the matting or prevent the matting from maintaining contact with ground. Rolled erosion control products shall not be stretched or allowed to bridge over surface inconsistencies. For areas where rolled erosion control products are to be installed and seed and amendments are also to be applied, all seed and amendments shall be applied prior to installation of the rolled erosion control products. Rolled erosion control product and grou nd fasteners shall be installed in accordance with the Contract or the manufacturer’s recommendations, whichever is more stringent.
1.Rolled Erosion Control Product, Type I . Type I rolled erosion control product shall be used to provide temporary erosion control while vegetation is established in those areas where vegetation will provide permanent erosion protection. Type I rolled erosion control product shall meet the requirements of Table 755.11A for the specific site properties as applicable. 6-213 Type I rolled erosion control product shall not be applied to grades steeper than 1:1 (V:H) . The Contractor shall maintain Type I rolled erosion control product through turf establishment in accordance with Section 651 .
2.Rolled Erosion Control Product, Type II . Type II rolled erosion control product shall be used to provide permanent erosion control where vegetation will not sustain expected flow conditions or provide sufficient long -term erosion protection. Type II rolled erosion control product shall meet the requirements of Table 755.11B for the specific site properties as applicable. The Contractor shall maintain Type II rolled erosion control product throug h acceptance of the project . No vehicular traffic of any kind will be permitted over stabilization measures during or after placement. Damage or displacement of stabilization measures through the fault of the Contractor shall be replaced or repaired at the Contractor’s expense. 653.0 8 RUNOF F CONTRO L MEASURES . Runoff control measures shall be used to slow runoff in accordance with the Contract .
a.Check Dams . Check dams shall be used for the primary purpose of reducing flow velocity and the secondary purpose of allowing sedi ment to settle . Check dams, of the type specified, shall be installed in the water flow path, as shown on the Plans, in accordance with the Contract and as directed by the Engineer.
1.Check Dam, Type I . Type I check dams shall be placed in channels and on Geotextile Under Stone Fill meeting the requirements of Subsection 720.04 . Type I check dams shall be constructed of aggregate for erosion prevention and sediment control meeting the requirements of Subsection 704.17 .
2.Check Dam, Type II . Type II check dams shall be placed along curbs. Type II check dam structures shall vary in height, width, and length depending on s ite-specific conditions. They shall have a minimum height of 4 inches, a minimum width of 6 inches, and shall extend 1 foot in a direction perpendicular to the curb and 2 feet up gradient of the curb at an angle ranging from 30° to 60° from the curb face. 6-214 For slope s of 3% or less, Type II check dams shall be constructed of stone meeting the requirements of Subsection 704.02 and Table 704.02 D. For slope s greater than 3%, Type II check dams shall be constructed of stone meeting the requirements of Subsection 704.17 .
3.Check Dam, Type III . Type III check dams shall be installed in accordance with the Contract and the manufacturer’s recommendations. Type III check dams shall be one of the Type III check dam products on the Agency’s Approved Products List. The Contractor shall remove accumulated sediment when the depth of the sediment reaches half the height of the check dam, measured at the ditch flowline . Check dams shall be removed from the project when deemed no longer necessary by the Engineer and shall remain the property of the Contractor.
b.Silt Fence . Silt fence shall be installed in accordance with the Contract and shall be installed perpendicular to the water flow to intercept and collect sediment and associated pollutants by filtering and settling.
1.Silt Fence, Type I . Type I silt fence shall be constructed of posts and geotextile meeting the requirements of Subsection 720.07 .
2.Silt Fence, Type II . Type II s ilt fence s hall be constructed of posts, geotextile meeting the requirements of Subsection 720.07 , and woven wire reinforcement. The Contractor shall remove accumulated sediment when it reaches half the height of the silt fence above the existing ground. The Contractor shall repair or replace damaged silt fence as ordered by the Engineer. Silt fence shall be removed from the project by the Contractor when deemed no longer necessary by the Engineer, and shall remain the property of the Contractor.
c.Erosion Logs . Erosion logs shall be installed to intercept water flow and collect sediment and associated pollutants by settling and filtering . Erosion logs may be placed over bare or mulched soils or rolled erosion control products , around inlet and outle ts, to slow runoff velocities in ditches, as slope interrupters on steep slope s, as perimeter control , and along stream banks as a base for plantings . The type of erosion log selected shall be designed for the intended application. 6-215 Prior to placing erosi on logs, the ground surface shall be properly graded and compacted and free of depressions or obstructions such as tree roots, protruding stones, or other foreign matter. Erosion logs shall be installed in accordance with the manufacturer’s installation gu idelines, staking pattern guide, and details based upon the intended use on the construction site. The Contractor shall remove accumulated sediment when it has reached one half of the effective height of the log, or as directed by the Engineer. Erosion l ogs shall be maintained until the disturbed area above the device has been permanently stabilized and construction activities ha ve ceased. Erosion logs shall be removed from the project and disposed of when deemed no longer necessary by the Engineer. When fill material and netting are 100% biodegradable, erosion logs may be cut open, spread or graded flat , and left in place, in a manner to not cause concentration of surface runoff in the future. 653.0 9 TREATMEN T MEASURES .
a.Stabilized Construction Entrances . Stabilized construction entrances shall be constructed at each access point between the construction area and all public or private roads . The Contractor shall maintain any existing drainage and flow paths within the stabilized construction entrance. Stabilized construction entrances shall be constructed of stone meeting the requirements of Subsection 704.17 and shall be placed on top of geotextile meeting the requirements of Subsection
720.04 .
Stabilized construction entrances shall be maintained such that aggregate does not become clogged, resulting in tracking of sediment onto public rights -of-way. Additional aggregate may be added on top of the existing aggregate only to a point which a smooth transition between the road surface and construction area is maintained . When a smooth transition can no longer be maintained when adding aggregate , the stabilized construction entrance shall be removed in its entirety and replaced. Stabilized construction entrances shall be rem oved from the project and disposed of when deemed no longer necessary by the Engineer.
b.Inlet Protection Devices . Inlet protection devices shall be used for treating stormwater prior to entering a drainage structure. Inlet protection devices shall be co nstructed and installed such that flow is directed through the device and into the inlet. The Contractor shall remove accumulated sediment when it reaches half the height, at its lowest point, of inlet protection devices. 6-216 (1) Inlet Protection Device, Type I . Type I i nlet protection devices shall be for use at drop inlets located outside of roadway surface and shall be installed in accordance with the Contract . Block and stone devices shall be constructed of aggregate for erosion prevention and sediment control and concrete blocks approved by the Engineer. Stake and fabric devices shall be constructed of geotextile meeting the requirements of Subsection 720.07 and stakes approved by the Engineer. When deemed necessary by the Engineer, filtering aggregate shall be applied to the upstream surface of the Type I inlet protection device . Type I inlet protection devices shall be removed from the project and disposed of when deemed no longer necessary by the Engineer.
2.Inlet Protection Device, Type II . Type II inlet protection devices shall be for use at drop inlets located within the roadway surface and shall be installed in accordance with the Contract and the manufacturer’s recommendations. Type II inlet protection devices shall be one of the Type II inlet protection devices on the Agency’s Approved Products List . Type II inlet protection devices shall be removed from the project when deemed no longer necessary by the Engineer and shall remain the pr operty of the Contractor.
3.Inlet Protection Device, Type III . Type III inlet protection devices shall be for use at culvert inlets and shall be installed in accordance with the Contract . Type III inlet protection devices shall be constructed of aggregate for erosion prevention and sediment control and shall be placed on top of geotextile meeting the requirements of Subsection 720.04 . When deemed necessary by the Engineer, filtering aggregate shall be applied to the upstream surface of the Type II I inlet protection device . Type III inlet protection devices shall be removed from the project and disposed of when deemed no longer necessary by the Engineer. Aggregate may be flattened along the channel upon approval of the Engineer. Geotextile shall be removed. 6-217 (c) Filter Bag . A filter bag is a device that may be used during dewatering pumping operations. The filter bag shall retain silt, sand, and fines while allowing filtered water to pass through. Where possible, a filter bag shall be placed a mini mum of 50 feet from any waters of the state and on a gradual slope in order that incoming water flows downhill through the bag. To increase the efficiency of filtration the filter bag shall be placed on a coarse aggregate or hay bale bed, unless otherwise directed by the Engineer or specified in the Contract . The neck of the filter bag shall be strapped tightly to the discharge hose. A filter bag is full when it no longer can efficiently filter sediment or allow water to pass at a reasonable rate. Use of excessive flow rate or overfilling a filter bag with sediment will cause rupture of the bag or failure of the hose attachments and shall not be permitted under any circumstances. Filter bags shall be one of the filter bags on the Agency’s Approved Products List . Filter bags shall be disposed of at an approved location as directed by the Engineer. 653.1 0 METHO D OF MEASURMENT . The quantity of EPSC Plan to be measured for payment will be on a lump sum basis for design and modification of an EPSC Plan in the complete and accepted work . The quantity of Monitoring EPSC Plan to be measured for payment will be the number of hours, authorized by the Engineer, actually spent monitoring the EPSC Plan . Hours will be rounded to the nearest quarter hour . Travel time and other time not spent at the construction sites, or time not authorized by the Engineer, will not be measured for payment ( e.g. travel expe nses, clerical staff time, copying, miscellaneous expenses, overhead, etc.). The quantity of Maintenance of EPSC Plan will be on a dollar basis for installation and maintenance of EPSC measures not otherwise included in the Contract. The quantity of Barrie r Fence, Project Demarcation Fence, Erosion Log, Silt Fence, Type I and Silt Fence , Type II to be measured for payment will be the number of linear feet used in the complete and accepted work . The quantity of Hay Mulch and Straw Mulch to be measured for pa yment will be the number of tons used in the complete and accepted work . The quantity of Hydraulic Mulch to be measured for payment will be the number of gallons used in the complete and accepted work . 6-218 The quantity of Rolled Erosion Control Product, of the type specified, to be measured for payment will be the number of square yards used in the complete and accepted work , as measured in its final position using slope measurements for determining area. The quantity of Check Dam, Type I, Check Dam, Type II, Stabilized Construction Entrance, and Inlet Protection Device, Type III to be measured for payment will be the number of cubic yards of the stone specified used in the complete and accepted work . The qua ntity of Check Dam, Type II I, Inlet Protection Device, Type I, Inlet Protection Device, Type II and Filter Bag to be measured for payment will be for each used in the complete and accepted work . Wood Chip Mulch will not be measured for payment separately b ut will be considered incidental to other Contract item s. 653.1 1 BASIS OF PAYMENT . The accepted quantity of EPSC Plan will be paid for at the Contract lump sum price . Payment will be full compensation for the initial preparation of an EPSC Plan, modificat ions, submittals, and all incidentals necessary to complete the work . Subsequent modifications to the EPSC Plan during construction will be considered incidental. The accepted quantity of Monitoring EPSC Plan will be paid for at the Contract unit price per hour. Payment will be full compensation for monitoring, reviewing, and reporting on the construction site, including waste, borrow, and staging area s or other support activities, as it relates to the EPSC Plan . Payment will not be made unless a report for the monitoring is submitted to the Engineer within 7 calendar days of the date of the inspection. Payment will not be made until the report has been accepted by the Engineer. The accepted quantity of Maintenance of EPSC Plan will be paid for as specified for force account work in Subsection 109.06 . Payment will be drawn against the Contract dollar amount . To provide a common proposal for all bidders, the Agency has entered an a mount in the proposal to become part of the Contractor’s total bid . Maintenance related to material supply and disposal areas shall be performed in accordance with Subsection 105.2 8. The accepted quantities of delineatio n measures, stabilization measures, run-off control measures, and treatment measures will be paid for at the Contract unit price specified for each item. Payment shall be full compensation for furnishing, transporting, handling, placing, and removing the material specified and for furnishing all labor, tools, equipment , and incidentals necessary to complete the work . Geotextile, culverts, excavation, or any other items necessary to complete the work shall be considered incidental to the appropriate Contract item . Unless otherwise specified in the Contract, payment for the maintenance of erosion prevention and sediment control measur es will be incidental to the specific Contract item . 6-219 Payment will be made under: Pay Item Pay Unit
653.01 00 EPSC Plan ................................ ................................ ................................ .Lump Sum
653.02 00 Monitoring EPSC Plan ................................ ................................ .............. Hour
653.03 00 Maintenance of EPSC Plan (N.A.B.I.) ................................ ..................... Dollar
653.10 00 Hay Mulch ................................ ................................ ................................ Ton
653.11 00 Hydraulic Mulch ................................ ................................ ....................... Gallon
653.12 00 Straw Mulch ................................ ................................ .............................. Ton
653.20 01 Rolled Erosion Control Product, Type I ................................ ................... Square Yard
653.2 002 Rolled Erosion Control Product, Type II ................................ .................. Square Yard
653.25 01 Check Dam, Type I ................................ ................................ ................... Cubic Yard
653.2 502 Check Dam, Type II ................................ ................................ .................. Cubic Yard 653.2503 Check Dam, Type III ................................ ................................ ................ Each
653.35 00 Stabilized Construction Entrance ................................ .............................. Cubic Yard
653.40 01 Inlet Protection Device , Type I ................................ ................................ .Each
653.4 002 Inlet Protection Device, Type II ................................ ................................ Each 653.4 003 Inlet Protection Device, Type III ................................ .............................. Cubic Yard
653.45 00 Filter Bag ................................ ................................ ................................ ..Each
653.47 01 Silt Fence, Type I ................................ ................................ ...................... Linear Foot
653.47 02 Silt Fence, Type II ................................ ................................ ..................... Linear Foot
653.50 00 Barrier Fence ................................ ................................ ............................. Linear Foot
653.55 00 Project Demarcation Fence ................................ ................................ .......Linear Foot
653.60 00 Erosion Log ................................ ................................ ............................... Linear Foot
6-220 SECTION 654 – STORMWATER TREATMENT PRACTICES
654.01 DESCRIPTION . This work shall consist of constructing stormwater treatment practices as shown
on the Plans.
654.02 MATERIALS . Materials shall meet the requirements of the following subsections:
Granular Borrow ................................ ................................ ................................ ........ 703.04 Fine Aggregate for Concrete ................................ ................................ ...................... 704.01 Coarse Aggregate for Concrete ................................ ................................ .................. 704.02 Gravel Filter for Slope Stabilization ................................ ................................ .......... 704.07 Drainage Aggregate ................................ ................................ ................................ ...704.16 Stone Fill ................................ ................................ ................................ .................... 706.04 Corrugated Polyethylene Pipe (CPEP) ................................ ................................ ......710.03 Acrylonitrile -Butadiene -Styrene (ABS) Plastic Pipe ................................ ................. 710.0 4 Polyvinyl Chloride (PVC) Plastic Pip e ................................ ................................ ......710.0 5 Bar Reinforcement ................................ ................................ ................................ .....713.01 Iron Castings ................................ ................................ ................................ .............. 715.01 Geotextile for Roadbed Separator ................................ ................................ .............. 720.02 Geotextile for Underdrain Trench Lining ................................ ................................ ..720.05 Compost ................................ ................................ ................................ ..................... 755.05 Geomembrane Liner ................................ ................................ ................................ ..760.07 Clay soil shall meet the requirements of Table 703.01A for group classific ation A-7-6. Precast concrete shall meet the requirements of Section 540 . Cast-in-place concrete shall meet the requirements of Section 541 for Concrete, Class B. Bedding for gravel wetland shall conform to the requirements of Subsection 704.02 . The layer of 1-1/2 inch bedding shall be in accordance with Table 704.02 D. The layer of 3/8 inch bedding shall be in accordance with Table 704.02 B. Media filter drain soil shall consist of mineral aggregate, perlite, dolomite lime, and gypsum in the quantities shown in the Vermont Stormwater Management Manual Rule and Design Guidance , Table 6 -
1.The composition of perlite, dolomite lime, and gypsum sh all meet the amendment requirements of the Vermont Stormwater Management Manual Rule and Design Guidance, Table 6 -1. The mineral aggregate component shall meet the requirements of Table 704.02 B. Bioretention soil shall meet the requirements of Table 654.0 2A.
Source: Vermont Standard Specifications for Construction, 2024 Edition. Pages 982–993 of 1,380.